Apparatus

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sensors Mode-S transponder

15203B

ICAO 24-bit transponder address · allocated to Russia

Currently assigned to RA-73787 · AIRBUS A-330-300

Hex
15203B
Octal
05220073
Decimal
1,384,507
Country
RU
Tail
RA-73787
Type
A333
No current signal · last broadcast 19h ago
Flights observed
160
Distinct callsigns
20
Country
RU
Last broadcast
19h ago

Last known position

Most recent position reported by Mode-S 15203B.

Country allocation

The ICAO 24-bit address 15203B falls within the block assigned to Russia (RU) by ICAO Annex 10, Volume III. Every aircraft registered in Russia receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
AFL733 - 19 2026-07-12
AFL629 - 11 2026-06-23
AFL628 - 10 2026-07-13
AFL626 - 10 2026-07-13
AFL643 - 9 2026-07-01
AFL735 - 8 2026-07-11
AFL734 - 7 2026-07-11
AFL627 - 6 2026-06-22
AFL233 - 6 2026-06-27
AFL232 - 6 2026-06-26
AFL620 Aeroflot Russian Airlines 5 2026-05-02
AFL837 Aeroflot Russian Airlines 4 2026-06-06
AFL635 - 4 2026-07-02
AFL621 Aeroflot Russian Airlines 4 2026-05-03
AFL861 Aeroflot Russian Airlines 3 2026-04-14
AFL831 Aeroflot Russian Airlines 3 2026-05-23
AFL651 Aeroflot Russian Airlines 3 2026-05-22
AFL293 Aeroflot Russian Airlines 3 2026-06-12
AFL863 Aeroflot Russian Airlines 2 2026-04-13
AFL855 Aeroflot Russian Airlines 2 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AFL626 - Jul 13, 22:15 UTCJul 14, 09:25 UTC11h 10m
2026-07-13 AFL626 - Jul 13, 09:25 UTCJul 14, 08:45 UTC23h 20m
2026-07-13 AFL626 - Jul 13, 07:50 UTCJul 14, 02:35 UTC18h 45m
2026-07-13 AFL626 - Jul 13, 02:50 UTCJul 14, 02:35 UTC23h 45m
2026-07-13 AFL628 - Jul 13, 00:50 UTCJul 14, 00:35 UTC23h 45m
2026-07-12 AFL628 - Jul 12, 22:50 UTCJul 13, 22:45 UTC23h 55m
2026-07-12 AFL628 - Jul 12, 17:20 UTCJul 12, 17:35 UTC15m
2026-07-12 AFL733 - Jul 12, 04:15 UTCJul 12, 11:20 UTC7h 5m
2026-07-11 AFL733 - Jul 11, 12:50 UTCJul 12, 11:20 UTC22h 30m
2026-07-11 AFL735 - Jul 11, 11:40 UTCJul 12, 10:45 UTC23h 5m
2026-07-11 AFL734 - Jul 11, 07:35 UTCJul 11, 09:10 UTC1h 35m
2026-07-09 AFL2982 - Jul 9, 21:15 UTCJul 9, 23:20 UTC2h 5m
2026-07-09 AFL733 - Jul 9, 15:15 UTCJul 9, 15:40 UTC25m
2026-07-09 AFL733 - Jul 9, 05:05 UTCJul 9, 12:40 UTC7h 35m
2026-07-04 AFL1553 SVO → SVO Jul 4, 09:05 UTCJul 4, 09:15 UTC10m
2026-07-03 AFL637 - Jul 3, 07:35 UTCJul 3, 19:25 UTC11h 50m
2026-07-02 AFL635 - Jul 2, 08:50 UTCJul 3, 08:45 UTC23h 55m
2026-07-01 AFL643 - Jul 1, 16:05 UTCJul 2, 09:25 UTC17h 20m
2026-07-01 AFL643 - Jul 1, 13:00 UTCJul 2, 09:25 UTC20h 25m
2026-07-01 AFL643 - Jul 1, 11:30 UTCJul 2, 09:25 UTC21h 55m
2026-07-01 AFL643 - Jul 1, 06:50 UTCJul 2, 04:00 UTC21h 10m
2026-07-01 AFL643 - Jul 1, 06:25 UTCJul 2, 04:00 UTC21h 35m
2026-07-01 AFL642 - Jul 1, 01:30 UTCJul 1, 23:30 UTC22h 0m
2026-06-29 AFL637 - Jun 29, 22:15 UTCJun 30, 09:45 UTC11h 31m
2026-06-29 AFL635 - Jun 29, 06:59 UTCJun 30, 04:45 UTC21h 46m
2026-06-29 AFL635 - Jun 29, 02:50 UTCJun 29, 23:54 UTC21h 5m
2026-06-29 AFL635 - Jun 29, 01:25 UTCJun 29, 23:54 UTC22h 30m
2026-06-28 AFL643 - Jun 28, 22:49 UTCJun 29, 22:44 UTC23h 55m
2026-06-28 AFL643 - Jun 28, 13:45 UTCJun 29, 08:44 UTC19h 0m
2026-06-28 AFL643 - Jun 28, 08:59 UTCJun 29, 08:44 UTC23h 45m
2026-06-28 AFL643 - Jun 28, 04:50 UTCJun 29, 03:34 UTC22h 45m
2026-06-28 AFL642 - Jun 28, 03:45 UTCJun 29, 02:45 UTC23h 0m
2026-06-27 AFL636 - Jun 27, 22:55 UTCJun 28, 22:45 UTC23h 50m
2026-06-27 AFL233 - Jun 27, 02:50 UTCJun 27, 03:30 UTC40m
2026-06-26 AFL232 - Jun 26, 23:25 UTCJun 27, 00:10 UTC45m
2026-06-26 AFL232 - Jun 26, 02:50 UTCJun 27, 00:10 UTC21h 20m
2026-06-26 AFL232 - Jun 26, 02:44 UTCJun 27, 00:10 UTC21h 25m
2026-06-25 AFL232 SVO → SVO Jun 25, 18:59 UTCJun 25, 19:29 UTC30m
2026-06-24 AFL225 - Jun 24, 22:00 UTCJun 25, 03:04 UTC5h 5m
2026-06-24 AFL224 - Jun 24, 13:34 UTCJun 24, 18:55 UTC5h 20m
2026-06-24 AFL224 SVO → SVO Jun 24, 10:10 UTCJun 24, 10:25 UTC15m
2026-06-23 AFL629 - Jun 23, 15:09 UTCJun 23, 15:19 UTC10m
2026-06-22 AFL626 - Jun 22, 21:59 UTCJun 23, 06:39 UTC8h 40m
2026-06-22 AFL626 - Jun 22, 09:19 UTCJun 23, 06:39 UTC21h 20m
2026-06-22 AFL627 - Jun 22, 07:40 UTCJun 23, 06:39 UTC23h 0m
2026-06-21 AFL627 - Jun 21, 22:49 UTCJun 22, 22:44 UTC23h 55m
2026-06-21 AFL627 - Jun 21, 22:29 UTCJun 22, 10:19 UTC11h 50m
2026-06-21 AFL628 - Jun 21, 17:15 UTCJun 21, 17:35 UTC20m
2026-06-21 AFL733 - Jun 21, 04:04 UTCJun 21, 11:05 UTC7h 0m
2026-06-20 AFL732 - Jun 20, 23:29 UTCJun 20, 23:45 UTC15m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the RA-73787 page for operator, model, and routing details .

Mode-S 15203B frequently asked

What is Mode-S code 15203B?
15203B is an ICAO 24-bit transponder address. Allocated to Russia. Assigned to RA-73787.
Where is Mode-S 15203B registered?
Mode-S code 15203B is allocated to Russia (RU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 15203B broadcasting right now?
No active broadcast right now. Last signal was 19h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 15203B, octal 05220073, decimal 1,384,507.
What flights does 15203B operate?
Mode-S 15203B has broadcast 20 distinct callsigns, including AFL733, AFL629, AFL628, AFL626, AFL643.